Deck 5

Question 1

Haemoproteus is a parasite of?

Answer 1

Birds

Question 2

Phylum of Trichomonads?

Answer 2

Phylum Metamonada

(They are a group of flagellated protozoa classified under the class Parabasalia)

Question 3

Position of small and large babesia in erythrocytes?

Answer 3

Large: merozoites located centrally (larger than the radius of the RBC).

Small: located in the periphery of the cell (smaller than radius of RBC)

Question 4

Pathology of Giardia
Attachment of trophozoite causes:

Answer 4

1. Shortening of villi
2. inflammation of crypts and lamina propria,
3. lesions of mucosal cells.
4. Malabsorption syndrome (steatorrhea)

Question 5

What is the pathology of Cryptosporidium? How is it diagnosed?

Answer 5

Watery acute diarrhea, serious in young

Diagnosis: finding thick walled oocyst by fecal sample. Carbon fuchsin staining. Scrapings from trachea of birds. ELISA. Abs.

Question 6

Pathology of toxoplasma?

Answer 6

Trophozoites directly destroy host cells, especially parenchymal and reticuloendothelial cells. Lymph node infection, local hypersensitivity, blood vessel blockage, abortions, stillbirth, chorioretinitis, hydroceohalus

Question 7

Pathology of Histomonas, what are its lesions?

Answer 7

Lesions in cecum and liver, perforation in cecum and liver, large inflamated cecum, yellow diarrhea, droopiness, black head.
1.invasive stage
2.vegetative stage
3.resistant stage
4.flagellated stage

Question 8

What are the important coccidian of poultry? Pathogenesis, clin. Signs, treatment?

Answer 8

Chicken: E. maxima, E. tenello
Turkey: e. galloparones, E. meleagrimitis, E. adenoidea
Goose: E. truncata, E. anseris

Pathogenesis & clinical signs: Destroys intestinal epithelium. Hemorrhage and malabsorption. Decreased production and weight gain. Death
Treatment: Coccidiostats (amprolium, toltrazuril, ionophores, sulfonamides), vaccination (livacox),ATB (tylosin/amoxicillin), sanitation.

Question 9

Life cycle: Entamoeba

Answer 9

Host ingest mature cyst -> excyst in intestine, trophozoites release, can also penetrate mucosa and migrate to b.v, liver, brain, lung (extraintestinal disease) -> multiplication by binary fission -> encyst/ or not -> cyst/ trophozoite shed in feces

Question 10

Trypanosoma brucei is transmitted by:

Answer 10

tsetse fly - Glossna spp.

Question 11

Acute sleeping sickness is caused by:

Answer 11

T. rhodesiensis

Question 12

Leishmania tropica causes:

Answer 12

cutaneous leishmaniasis

Question 13

What is the life cycle of Leishmania?

Answer 13

female fly inject promastigote during blood meal -> amastigote in macrophages (after phagocytosis) and multiplication ->fly ingest amastigote found in blood during blood meal-> midgut transformation to promastigote -> multiply by binary fission -> migration to proboscis

Question 14

Giardia intestinalis belongs to:

Answer 14

Diplomonadida

Question 15

Cryptosporidium baileyi occurs in:

Answer 15

Poultry

Question 16

What size is the oocyst of Toxoplasma gondii?

Answer 16

12um

Question 17

Gametogony of T. gondii occurs in the small intestine of:

Answer 17

Carnivores (felidae)

Question 18

How is a human infected by toxoplasma?

Answer 18

-Ingestion of sporulated oocysts (cat feces)
-Ingestion of zoites (undercooked meat)
-Congenital infection (only during acute stage)
-Organ transplants
o Chronic infection in donor
o Immunosuppression
-Blood transfusions (only during acute stage)

Question 19

What is the life cycle of babesia canis

Answer 19

Infected tick inject sporozoites to mammalian host -> sporozoites enter RBC and undergo binary fission ->sporozoites (schizont?) release merozoites and the RBC rapture -> merozoites will invade next RBC-> tick (DH) suck blood of infected host and ingest parasite -> gamagony in tick’s midgut -> kinet -> transovarial/transstadial transmission

Question 20

Sarcocystis is transmitted by:

Answer 20

cysts